Had a bizarre issue too. Installed it in XP pro and when it finished it asked me to click on finish to complete install.
I clicked on it at least 3 times and it took the best part of 10 mins to finally take me to the changes page. Not had this issue before.
BTW it has not messed with the cfg files. Just checked and they look the same.
I hope it has improved SLI compatibility as this games truly sucks with SLI. I have to play at 1280x1050 to get really playable framerates. A joke no?
I'll give it a whirl in next 48 hours and post back.
Asus P5N32-E-SLI mobo, Intel Core 2 Quad 6600 at 2.7, Radeon HD5850 1GB, HP 22" LCD @ 1680x1050, 4Gb AData 800 mhtz ram, 1TB Samsung Spinpoint F1 & 250gb Seagate H/D, 2x DVD Burners, X-FI Xtreme Gamer, Thermaltake ToughPower 700w PSU